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IB/hfi1: Fix loss of BECN with AHG 

AHG may be armed to use the stored header, which by design is limited
to edits in the PSN/A 32 bit word (bth2).

When the code is trying to send a BECN, the use of the stored header
will lose the BECN bit.

Fix by avoiding AHG when getting ready to send a BECN. This is
accomplished by always claiming the packet is not a middle packet which
is an AHG precursor.  BECNs are not a normal case and this should not
hurt AHG optimizations.

Cc: <stable@vger.kernel.org> # 4.14.x
Reviewed-by: Michael J. Ruhl <michael.j.ruhl@intel.com>
Signed-off-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Mike Marciniszyn 2018-05-01 05:35:51 -07:00 committed by Doug Ledford
parent 5da9e742be
commit 0a0bcb046b
1 changed files with 40 additions and 10 deletions
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50
drivers/infiniband/hw/hfi1/ruc.c
View File

@ -733,6 +733,20 @@ static inline void hfi1_make_ruc_bth(struct rvt_qp *qp,
ohdr->bth[2] = cpu_to_be32(bth2);
}
/**
* hfi1_make_ruc_header_16B - build a 16B header
* @qp: the queue pair
* @ohdr: a pointer to the destination header memory
* @bth0: bth0 passed in from the RC/UC builder
* @bth2: bth2 passed in from the RC/UC builder
* @middle: non zero implies indicates ahg "could" be used
* @ps: the current packet state
*
* This routine may disarm ahg under these situations:
* - packet needs a GRH
* - BECN needed
* - migration state not IB_MIG_MIGRATED
*/
static inline void hfi1_make_ruc_header_16B(struct rvt_qp *qp,
struct ib_other_headers *ohdr,
u32 bth0, u32 bth2, int middle,
@ -777,6 +791,12 @@ static inline void hfi1_make_ruc_header_16B(struct rvt_qp *qp,
else
middle = 0;
if (qp->s_flags & RVT_S_ECN) {
qp->s_flags &= ~RVT_S_ECN;
/* we recently received a FECN, so return a BECN */
becn = true;
middle = 0;
}
if (middle)
build_ahg(qp, bth2);
else
@ -784,11 +804,6 @@ static inline void hfi1_make_ruc_header_16B(struct rvt_qp *qp,
bth0 |= pkey;
bth0 |= extra_bytes << 20;
if (qp->s_flags & RVT_S_ECN) {
qp->s_flags &= ~RVT_S_ECN;
/* we recently received a FECN, so return a BECN */
becn = true;
}
hfi1_make_ruc_bth(qp, ohdr, bth0, bth1, bth2);
if (!ppd->lid)
@ -806,6 +821,20 @@ static inline void hfi1_make_ruc_header_16B(struct rvt_qp *qp,
pkey, becn, 0, l4, priv->s_sc);
}
/**
* hfi1_make_ruc_header_9B - build a 9B header
* @qp: the queue pair
* @ohdr: a pointer to the destination header memory
* @bth0: bth0 passed in from the RC/UC builder
* @bth2: bth2 passed in from the RC/UC builder
* @middle: non zero implies indicates ahg "could" be used
* @ps: the current packet state
*
* This routine may disarm ahg under these situations:
* - packet needs a GRH
* - BECN needed
* - migration state not IB_MIG_MIGRATED
*/
static inline void hfi1_make_ruc_header_9B(struct rvt_qp *qp,
struct ib_other_headers *ohdr,
u32 bth0, u32 bth2, int middle,
@ -839,6 +868,12 @@ static inline void hfi1_make_ruc_header_9B(struct rvt_qp *qp,
else
middle = 0;
if (qp->s_flags & RVT_S_ECN) {
qp->s_flags &= ~RVT_S_ECN;
/* we recently received a FECN, so return a BECN */
bth1 |= (IB_BECN_MASK << IB_BECN_SHIFT);
middle = 0;
}
if (middle)
build_ahg(qp, bth2);
else
@ -846,11 +881,6 @@ static inline void hfi1_make_ruc_header_9B(struct rvt_qp *qp,
bth0 |= pkey;
bth0 |= extra_bytes << 20;
if (qp->s_flags & RVT_S_ECN) {
qp->s_flags &= ~RVT_S_ECN;
/* we recently received a FECN, so return a BECN */
bth1 |= (IB_BECN_MASK << IB_BECN_SHIFT);
}
hfi1_make_ruc_bth(qp, ohdr, bth0, bth1, bth2);
hfi1_make_ib_hdr(&ps->s_txreq->phdr.hdr.ibh,
lrh0,